Post treatment of casting, heat treatment, shaping, anti-rust treatment and roughing of the cleaned castings. Post-casting of castings is the last step in casting production. Definition Post treatment of casting, heat treatment, shaping, anti-rust treatment and roughing of the cleaned castings. Post-casting of castings is the last step in casting production.
Type heat treatment: In order to improve or change the original structure of the casting, eliminate the internal stress, ensure the performance of the casting, prevent the deformation and damage of the casting, and after the casting is cleaned, some need to be heat treated. Casting heat treatment generally has quenching, annealing, normalizing, as-casting and quenching, artificial aging (see aging treatment), stress relief, softening and graphitization. For example, high manganese steel castings require high wear resistance and sufficient toughness, and the internal structure should be austenite. To this end, the casting needs to be quenched, that is, after the casting is heated to the austenite region to be completely austenitized, it is rapidly quenched and quenched, so that the austenite can not be changed and maintained. This process is also called water toughness treatment or solution treatment.
Plastic surgery: divided into three aspects of correction, repair and surface finishing. Some castings are deformed during solidification, cooling, and heat treatment, causing some parts to be out of tolerance and need to be repaired by corrective methods. Correction is mainly carried out at room temperature or in a warm state using mechanical strength. When the amount of deformation is too large, it is also possible to perform high temperature correction using the weight of the casting or the external pressure in the heating furnace. The external defects of the casting are mainly repaired by welding. Leakage defects of airtight and liquid-tight castings are required to be solved by pressing the plugging agent. The surface of the casting is rough and uneven, and is usually polished by a hanging grinding wheel and a high-speed grinding wheel.
Roughing: Prior to the delivery of the casting, the part is roughed according to the technical conditions. After the roughing of the castings, the defects can be found in time to solve the problems, and the weight can be reduced, and the scraps and chips can be sorted and reused on the spot.
Anti-rust treatment: Some castings and machine tool castings are required to be rust-proofed before delivery to prevent rust during transportation and storage. Generally, the primer is applied after the final inspection.
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